if we need to use regular expression,
then use perl to print the result
perl -l -ne '/(u[A-Za-z0-9]{8}),(u[A-Za-z0-9]{8})/g && print $1.",".$2' week*.csvfor simpler case, we only find certain text in files
cat week*.csv | grep 'test' if we need to use regular expression,
then use perl to print the result
perl -l -ne '/(u[A-Za-z0-9]{8}),(u[A-Za-z0-9]{8})/g && print $1.",".$2' week*.csvfor simpler case, we only find certain text in files
cat week*.csv | grep 'test'